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export function lineTotal(qty, price) { return Math.round(qty * price * 100) / 100 const cents = Math.round(qty * price * 100) return cents / 100}export function invoiceTotal(lines) { return lines.reduce((s, l) => s + lineTotal(l), 0) return sumCents(lines) / 100}How it works
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A five minute pull request walkthrough
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- 0:00
This pull request fixes the rounding on invoice totals.
- 0:30
The bug: we rounded each line, then added them up. Totals drifted by a cent.
- 1:30
The fix: sum in cents and round once. Here is the test that failed before.
- 3:00
What I would like eyes on: the migration for old invoices.
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Good catch on the rounding. Ship it.